Polystyrene buoyancy foam 06 RXP

Hello All,
2006 RXP, looking at the parts diagrams, I canít see that the polystyrene buoyancy foam that sits up in the bow is available as a part, it only looks like it come with the hull.
Can anyone else find it on the diagrams?? On the 04 / 05 models it is show clearer in the pictures but again, not as a separate part you can buy.
Thanks